/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.inlong.sdk.transform.decode;

import org.apache.inlong.sdk.transform.process.Context;

/**
 * AbstractSourceData
 * 
 */
public abstract class AbstractSourceData implements SourceData {

    public static final String CTX_KEY = "$ctx.";

    protected Context context;

    protected boolean isContextField(String fieldName) {
        return fieldName.startsWith(CTX_KEY);
    }

    protected String getContextField(String fieldName) {
        if (context == null) {
            return "";
        }
        if (!isContextField(fieldName)) {
            return null;
        }
        String realFieldName = fieldName.substring(CTX_KEY.length());
        String fieldValue = this.context.getStringOrDefault(realFieldName, "");
        return fieldValue;
    }
}
